Blind void backing

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SIBERNUT

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Nov 11, 2022
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So I decide to do the arch instead of mast. Will be affixed to sides of bridge. I've been on lotsa boats, and every one had the bridge sides hollow.
NOT THIS ONE. There are wood members within the bridge sides almost where the arch will attach. But just off enough that they can't be relied on to hold to. I have fished oak backers with SS T nuts & caught a few. So question - you guys know of any SERIOUS expanding foam to fill weird shaped voids that would be a backer between these random pieces of wood?
 
No foam will likely do the job. Can you cut an access hatch to give you room to work?
 
Already did, 6" port in between 2 mtg points. Haha, Taiwanese brothers positioned vertical 4x4 members carefully calculated to not allow access fore or aft.........
Maybe concrete ?
 
Can you glass an aluminum plate in the area. I have used 1/4” aluminum plate as backing. Buttered it with thickened epoxy. Let the epoxy go off then drill and through bolt to it.
 
The "feet" of the arch are 4.5 dia , I have cut a 2" circle out in the center which would be hidden. That's all I have to work in. Wood verticals behind glass make it impossible to get any more access . So far I am working oak thru the holes & flipping it once in.
Oh, I WILL win. Just looking for better way. TKS!
 
aluminum bedded in fiberglass putty is the way to go even if they are in semi circles with counter sunk screws to hold them up in place
 
It ain't pretty but I won using oak semi circles. Not looking for longevity.

Guy wanted to sell me Trex decking on my house. I said why? I'm 78........
 
I have used structural 2 part foam for several projects. There are several densities to choose from but not cheap. Not sure what is dense enough for your application.

Google 2 part floatation foam.
Most epoxy suppliers carry it.
 
I`ve used foam to strengthen body channels of a rally car, but not a boat. You need a hole into the void to pour it in, and it can be hard to tell how far it expanded, heat was the indicator as well as sound. Holes at various heights to see where it gets to could help. Interesting stuff to use, be ready to pour as soon as it`s mixed. Worked a treat reinforcing the car.
 
Is the internal wood post close enough to attach an angle bracket that can be attached to the post and glassed in as a backer?
 
There is just no room to work. I cut an access port, sure enough there's more 3x3 wood in between that & the spot. I think I've got it , TKS!
 
Any backing I've needed has been FRP. Look here (McMaster-Carr). McMaster-Carr are easy to deal with.

I used this for backing on our windlass & for backing on the swim platform for davits.

No metals for dissimilar problems.
 
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